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Semicircle: An exact relation in the Integer and Fractional Quantum Hall Effect
M. Hilke, D. Shahar, S. H. Song +3
We present experimental results on the quantized Hall insulator in two dimensions. This insulator, with vanishing conductivities, is characterized by the quantization (within exper…
The Quantized Hall Insulator: A New Insulator in Two-Dimensions
M. Hilke, D. Shahar, S. H. Song +3
Quite generally, an insulator is theoretically defined by a vanishing conductivity tensor at the absolute zero of temperature. In classical insulators, such as band insulators, van…
Microwave Resonance and Carrier-Carrier Interaction in Two-Dimensional Hole Systems at High Magnetic Field
C. -C. Li, J. Yoon, L. W. Engel +3
Microwave frequency conductivity, Re(), of high quality two-dimensional hole systems (2DHS) in a large perpendicular magnetic field (B) is measured with the carrier density…
Observation of the Metal-Insulator Transition in Two-Dimensional n-type GaAs
Y. Hanein, D. Shahar, J. Yoon +3
The observation of a carrier-density driven metal-insulator transition in n-type GaAs-based heterostructure is reported. Although weaker than in comparable-quality p-type GaAs samp…
Wigner crystallization and metal-insulator transition of two-dimensional holes in GaAs/AlGaAs at B=0
Jongsoo Yoon, C. C. Li, D. Shahar +2
We report the transport properties of a low disorder two-dimensional hole system (2DHS) in the GaAs/AlGaAs heterostructure, which has an unprecedentedly high peak mobility of $7\ti…
Universality at integer quantum Hall transitions
Kun Yang, D. Shahar, R. N. Bhatt +2
We report in this paper results of experimental and theoretical studies of transitions between different integer quantum Hall phases, as well as transition between the insulating p…